Hi everyone, i was wondering can i put loose perlite on the floor and then an inch of a cob mixture as a support for the bricks?
The dome will be supported from the concreat-perlite slab, not from the loose perlite.
Does anyone used Stone Wool Boards on the hearth?

You can use loose perlite under your floor bricks, however if you then intend to cover this with a clay mixture you will end up with quite a mess as the wet clay mix will pick up the dry perlite. If you already have a vermicrete slab to work over it is easier to use a dry mix of 50/50 sand, clay to bed the floor bricks into.

You can use loose perlite under your floor bricks, however if you then intend to cover this with a clay mixture you will end up with quite a mess as the wet clay mix will pick up the dry perlite. If you already have a vermicrete slab to work over it is easier to use a dry mix of 50/50 sand, clay to bed the floor bricks into.

I think i'll just put a 5:1 perlite with cement under the floor and 2 cm sand for leveling.
Is it ok to make the dome an oval shape such as, 65 cm on the middle and 80 cm on the windth, i have already done my slab and i'ts 1,20 X 1,40, stupid me to make is so small...anyway i need at least an 80 cm oven and the widest point of the circle i'ts not enough space for the rockwool(5cm) and the loose perlite(10cm) that i will fill the closer with.
it's 131 cm with the width of the firebricks that will make the dome...seems i'm 11 cm sort!xaxaxaxa!

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